In the case of unilateral VCP subjects, discrimination shows better performance than that for the vocal fold polyp subjects.
Tables 2 and 3 show results of statistical feature analysis using static features in normal, vocal fold polyp, and unilateral VCP subjects for female and male subjects, respectively.
Figures 5 and 6 show DET curves to verify the classification performance using static and dynamic features between normal and vocal fold polyp subjects, and between normal and unilateral VCP subjects, respectively.
Considering the observation seen in Section 2.2, and statistical analysis above, it is concluded that vocal tract modification for unilateral VCP subjects is greater than that for vocal fold polyp subjects.
Similar results were demonstrated previously by Rasmussen et al. in a study of 24 control and 20 unilateral lymphedema subjects [ 7].
This indicates that the discrimination of pathological voice for unilateral VCP subjects is easier than the one for vocal fold polyp subjects.
For significant features, the mean of each formant standard deviation for unilateral VCP subjects is higher than that of the vocal fold polyp subjects.
Another observation is that the degree of difference in the AR spectrum between normal and unilateral VCP subjects is bigger than that between normal and vocal fold polyp subjects.
We selected 20 normal subjects (20 right eyes: 10 females, 10 males, ages 9 42 years), 18 unilateral amblyopic subjects (18 amblyopic eyes, ages 19 36 years), 19 patients with optic neuritis (19 eyes: ages 9 71 years), and 10 patients with visual disability having visual pathway lesion.
Most of our recruited tinnitus subjects reported bilateral tinnitus and there were only 3 subjects with unilateral tinnitus (two subjects reported tinnitus at the right ear, one subject at the left ear).
